Laser Cooling of a Bunched Beam in a Synchrotron Storage Ring

Hangst, J. S.; Nielsen, Jørgen S.; Poulsen, O.; Shi, Peng; Schiffer, J. P.

doi:10.1103/physrevlett.74.4432

Cited by 74 publications

(86 citation statements)

References 11 publications

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“…The first laser-cooling experiment of an ion beam was carried out at Test Storage Ring (TSR) by Schröder et al [5], and followed at Aarhus Storage Ring in Denmark (ASTRID) by Hangst et al [6]. Both groups successfully cooled the longitudinal motion of coasting beams of heavy ions circulating at high speed in the laboratory frame; this technique was further extended for a bunched beam also in the ASTRID ring by Hangst et al [7].…”

Section: Introductionmentioning

confidence: 99%

“…For the past several years, continuous effort has been devoted to attain a three-dimensionally ultracold ion beam circulating in a storage ring. In our present study, we more or less follow the ASTRID approach where a single laser is employed together with an rf voltage to cool a bunched 24 Mg þ ion beam in the longitudinal direction [7]. In case a beam is bunched with an rf field, individual ions execute synchrotron oscillations in the longitudinal phase space, and the rf electric field works as a counter force to the ions in the beam accelerated by copropagating laser with Doppler laser cooling, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Resonance coupling induced enhancement of indirect transverse cooling in a laser-cooled ion beam

Nakao

T.Hiromasa

Souda

et al. 2012

Phys. Rev. ST Accel. Beams

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We report the first observation of indirect resonantly enhanced transverse laser cooling of a bunched, stored ion beam of 40 keV 24 Mg þ . The longitudinal velocity distribution and the horizontal beam size of the laser-cooled 24 Mg þ ion beam with 280 nm laser light were simultaneously observed by the use of standard fluorescence-based techniques. Keeping the operation point at (2.068, 1.105), the synchrotron tune ( s ) was changed from 0.0376 to 0.1299. A strong decrease in the cooled horizontal beam size and a corresponding increase in the equilibrium cooled momentum spread were observed at the expected synchrobetatron resonance coupling condition of s ¼ 0:068, which is the first observation of a resonantly induced coupling for enhanced indirect transverse laser cooling of an ion beam, and is an important step towards creating a crystalline ground state of the beam.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resonance coupling induced enhancement of indirect transverse cooling in a laser-cooled ion beam

Nakao

T.Hiromasa

Souda

et al. 2012

Phys. Rev. ST Accel. Beams

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“…One-dimensional laser cooling of bunched ion beams by monochromatic laser beam is possible with accelerating fields of radiofrequency cavities (see section 2.1) [30]. The broadband laser beam with a sharp low frequency edge can be used as well.…”

Section: One-dimensional Laser Cooling Of Ion Beams In Storage Ringsmentioning

confidence: 99%

“…Experimentally, the version of longitudinal cooling of a bunched non-relativistic beam of 24 Mg + ions (kinetic energy ∼ 100 keV) was observed first in the storage ring ASTRID [30]. The monochromatic laser beam co-propagated with the ion beam (conditions of the ion acceleration) at scanning of its frequency and using the accelerating system of the storage ring.…”

Section: Introductionmentioning

confidence: 99%

Cooling of Particle Beams in Storage Rings

Bessonov

2002

Quantum Aspects of Beam Physics

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“…Two schemes exist to overcome this mismatch with the initial momentum distribution. The laser-or the bunching-frequency can be continuously tuned from a value where the laser is resonant with ions at the edge of the bucket to a final frequency close to its center [13]. This scheme is presented in Fig.…”

Section: The Prospect Of Laser Coolingmentioning

confidence: 99%

Laser Cooling of Relativistic Heavy Ion Beams

Schramm

Bußmann²,

Habs³

et al.

Proceedings of the 2005 Particle Accelerator Conference

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We report on the experimental demonstration of laser cooling of a ¿· ion beam performed at the ESR (GSI) at an energy of ½ GeV. The decelerating laser force of one Doppler-tuned UV laser beam was counteracted by moderately bunching the beam. This versatile scheme lead to longitudinally 'space-charge dominated' beams with an unprecedented momentum spread of ¡Ô Ô ½¼ . Concerning beam energy and charge state of the ion, the experiment depicts an important step from the field of laser cooling of ion beams at low energies toward the laser cooling scheme proposed for relativistic beams of highly charged heavy ions at the future GSI facility FAIR. THE PROSPECT OF LASER COOLINGThe cooling of stored heavy ion beams to high phasespace densities is of interest when low momentum spread or high luminosity is required. Ultimately, the reduction of the energy spread far below the mutual Coulomb energy of the ions leads to a phase transition -a crystallization of the ion beam -into a regime where collision dominated heating mechanisms vanish and maximum phase-space density is reached. In the low energy regime this phase transition could recently be demonstrated with laser-cooled ¾ Mg · ion beams in the rf quadrupole storage ring PALLAS [1,3]. However, as laser cooling relies on the repeated resonant scattering of photons, only a very limited number of ions can be accessed by this cooling technique at existing storage rings, benchmarking and present activities being summarized in [2].At heavy ion storage rings like ESR (GSI), electron cooling has developed into a versatile tool for the cooling of highly charged ions independent from their internal atomic properties [4]. As the cooling force (and the inter-ion coupling) roughly increases with the square of the ion charge, beam ordering effects of highly charged ions were observable with electron cooling at extremely low beam currents [5,6], where density dependent heating mechanisms become negligible.In the relativistic regime, that will be accessible at FAIR, the situation might be reversed. Electron cooling cannot be readily applied any more, while the laser force principally increases with the third power of the ion energy [2,7]. This prediction is based on the fast transition rates in high-Z £ Work supported by the German BMBF 06ML183 Ý www.ha.physik.uni-muenchen.de/uschramm/ few electron systems and the relativistically increased momentum transfer in the head-on scattering of laser photons. Moreover, ground-state transitions of all Li-and most Nalike heavy ions can be reached (Fig. 1) at the large synchrotrons at FAIR [8,9] enabling efficient laser excitation for cooling and spectroscopy [10]. LASER COOLING OF C ¿· IONS

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Laser Cooling of a Bunched Beam in a Synchrotron Storage Ring

Cited by 74 publications

References 11 publications

Resonance coupling induced enhancement of indirect transverse cooling in a laser-cooled ion beam

Resonance coupling induced enhancement of indirect transverse cooling in a laser-cooled ion beam

Cooling of Particle Beams in Storage Rings

Laser Cooling of Relativistic Heavy Ion Beams

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